#include <Arduino.h>
#include <Bounce2.h>

static const uint8_t NUM_SLIDERS = 5;
static const uint8_t NUM_BUTTONS = NUM_SLIDERS;

// hardware configuration
const uint8_t analogInputs[NUM_SLIDERS] = {A0, A1, A2, A3, A4};
const uint8_t digitalInputs[NUM_BUTTONS] = {5, 6, 7, 8, 9};

// state variables
int16_t analogSliderValues[NUM_SLIDERS] = {0};
bool muteStates[NUM_BUTTONS] = {false};

// bounce objects array
Bounce debouncers[NUM_BUTTONS];

// timing
unsigned long lastSendTime = 0;
const unsigned long SEND_INTERVAL = 10;  // 10ms interval for sending data

void setup() {
    // configure input pins
    for (uint8_t i = 0; i < NUM_SLIDERS; i++)
        pinMode(analogInputs[i], INPUT);
    
    // initialize buttons with debouncing
    for (uint8_t i = 0; i < NUM_BUTTONS; i++) {
        pinMode(digitalInputs[i], INPUT_PULLUP);
        debouncers[i].attach(digitalInputs[i]); // attach to bounce object
        debouncers[i].interval(25); // 25ms debounce interval
    }

    Serial.begin(115200);
}

void loop() {
    const unsigned long currentTime = millis();
    
    // update all debouncers
    updateButtons();
    
    // update and send at regular intervals
    if (currentTime - lastSendTime >= SEND_INTERVAL) {
        lastSendTime = currentTime;
        updateSliders();
        sendSliderValues();
    }
}

void updateSliders() {
    const uint8_t SAMPLES = 4; // number of samples for averaging
    
    for (uint8_t i = 0; i < NUM_SLIDERS; i++) {
        int32_t sum = 0;
        
        // average multiple readings to reduce noise
        for (uint8_t j = 0; j < SAMPLES; j++) {
            sum += analogRead(analogInputs[i]);
            delayMicroseconds(100); // brief delay between samples
        }
        
        analogSliderValues[i] = (sum / SAMPLES) * (muteStates[i] ? 0 : 1);
    }
}

void sendSliderValues() {
    for (uint8_t i = 0; i < NUM_SLIDERS; i++) {
        Serial.print(analogSliderValues[i]);
        if (i < NUM_SLIDERS - 1) Serial.print('|');
    }
    Serial.println();
}

void updateButtons() {
    for (uint8_t i = 0; i < NUM_BUTTONS; i++) {
        debouncers[i].update(); // update the debouncer
        
        // check for falling edge (button pressed)
        if (debouncers[i].fell())
          muteStates[i] = !muteStates[i]; // toggle mute state
    }
}